//
//  CartridgeParkerBros.h
//  Clock Signal
//
//  Created by Thomas Harte on 18/03/2017.
//  Copyright 2017 Thomas Harte. All rights reserved.
//

#pragma once

#include "Cartridge.hpp"

namespace Atari2600::Cartridge {

class ParkerBros: public BusExtender {
public:
	ParkerBros(const uint8_t *const rom_base, const std::size_t rom_size) :
		BusExtender(rom_base, rom_size)
	{
		rom_ptr_[0] = rom_base + 4096;
		rom_ptr_[1] = rom_ptr_[0] + 1024;
		rom_ptr_[2] = rom_ptr_[1] + 1024;
		rom_ptr_[3] = rom_ptr_[2] + 1024;
	}

	void perform_bus_operation(
		const CPU::MOS6502::BusOperation operation,
		uint16_t address,
		uint8_t *const value
	) {
		address &= 0x1fff;
		if(!(address & 0x1000)) return;

		if(address >= 0x1fe0 && address < 0x1ff8) {
			int slot = (address >> 3)&3;
			rom_ptr_[slot] = rom_base_ + ((address & 7) * 1024);
		}

		if(is_read(operation)) {
			*value = rom_ptr_[(address >> 10)&3][address & 1023];
		}
	}

private:
	const uint8_t *rom_ptr_[4];
};

}
